Journal of Mid-life Health Journal of Mid-life Health
Home | About us | Editorial board | Search | Ahead of print | Current Issue | Past Issues | Instructions | Online submission | Subscribe | Advertise Users Online: 738  Print this pageEmail this pageSmall font sizeDefault font sizeIncrease font size 




 
 Table of Contents 
ORIGINAL ARTICLE
Year : 2019  |  Volume : 10  |  Issue : 2  |  Page : 89-92  

Comparative diagnostic accuracy of frozen sections and scrape cytology in ovarian neoplasms


Department of Pathology, VMMC and Safdarjung Hospital, New Delhi, India

Date of Web Publication3-Jul-2019

Correspondence Address:
Dr. Charanjeet Ahluwalia
Department of Pathology, VMMC and Safdarjung Hospital, New Delhi - 110 029
India
Login to access the Email id

Source of Support: None, Conflict of Interest: None


DOI: 10.4103/jmh.JMH_114_18

Rights and Permissions
   Abstract 


Introduction: Frozen section is a well-established method for providing rapid and accurate intraoperative diagnosis. Cytological techniques such as imprint and scrape cytology and intraoperative fine-needle aspiration cytology are conventionally considered as less accurate alternatives to the frozen section. However, inexperienced hands, scrape cytology has been shown to provide remarkably accurate results comparable to the frozen section. Aims: The aims of this study are as follows: (1) To evaluate the diagnostic utility of scrape cytology in the intraoperative diagnosis of ovarian neoplasms. (2) To compare the accuracy of scrape cytology with frozen section in the intraoperative diagnosis of ovarian neoplasms. Materials and Methods: This study was conducted over a period of 3 years from 2014 to 2017. A total of 60 cases of clinically and radiologically suspected ovarian masses were included in the study. Thirty cases were evaluated using frozen section and 30 cases using scrape cytology alone. The intraoperative diagnosis of both was compared with the final paraffin section histopathology. Results: The diagnostic accuracy of scrape cytology and frozen section in determining a benign and malignant nature of neoplasm was 96% and 100%, respectively. In 93% of cases, scrape cytology enabled correct categorization of the tumor as surface epithelial, germ-cell tumor, sex cord-stromal, or others. Conclusion: Scrape cytology is an adjunct to frozen section for providing an intraoperative diagnosis; however, in resource-poor settings, it can be used as a stand-alone method for aiding intraoperative decision-making.

Keywords: Frozen sections, intraoperative diagnosis, ovarian neoplasms, scrape cytology


How to cite this article:
Bhardwaj S, Ahluwalia C, Yadav AK, Zaheer S, Kolte S, Arora R. Comparative diagnostic accuracy of frozen sections and scrape cytology in ovarian neoplasms. J Mid-life Health 2019;10:89-92

How to cite this URL:
Bhardwaj S, Ahluwalia C, Yadav AK, Zaheer S, Kolte S, Arora R. Comparative diagnostic accuracy of frozen sections and scrape cytology in ovarian neoplasms. J Mid-life Health [serial online] 2019 [cited 2019 Jul 18];10:89-92. Available from: http://www.jmidlifehealth.org/text.asp?2019/10/2/89/261973




   Introduction Top


Intraoperative pathology consultation is often required for guiding immediate surgical decisions such as to limit the extent of surgery, to perform radical surgery, or to terminate the surgery altogether. Frozen sections, first performed by Dr. Louis B. Wilson in 1905 at the request of the surgeon Dr. Mayo, have now become the cornerstone and the preferred method for providing rapid and accurate intraoperative diagnosis.[1] Over the years, the frozen section has provided fairly accurate results.[2] However, with the requirement of a cryostat, and skill in cutting fresh frozen sections, it is yet to find a place in small, resource-poor centers. These limitations can be overcome with the use of rapid, inexpensive, and simple cytological procedures such as scrape cytology. Scrape cytology was introduced for the intraoperative diagnosis much later in 1927,[3] yet, some studies have shown that with expertise it can give highly accurate results.[4]

However, a comparative diagnostic evaluation is needed to establish the utility of scrape cytology vis-a-vis frozen sections.

Aims

The aims of this study are as follows:

  1. To evaluate the diagnostic utility of scrape cytology in the intraoperative diagnosis of ovarian neoplasms
  2. To compare the accuracy of scrape cytology with frozen section in the intraoperative diagnosis of ovarian neoplasms.



   Materials and Methods Top


This was a retrospective study conducted over a period of 3 years from 2014 to 2017. The data for 60 cases of ovarian masses sent for intraoperative opinion were retrieved from records. Thirty of these cases had been evaluated with frozen section and scrape cytology, and 30 cases with scrape cytology alone. The final diagnoses provided on paraffin section histopathology were compared retrospectively with the intraoperative diagnosis.

The percentage diagnostic accuracy and positive predictive values of both scrape cytology and frozen section were calculated.

Frozen sections had been performed using the standard cryotome sectioning and staining with rapid H and E, taking about 15–20 min from specimen receiving to reporting. Scrape cytology smears were stained with rapid pap and toluidine blue, taking about 10 min from specimen receiving till reporting.


   Results Top


The overall diagnostic accuracy of scrape cytology in determining benign versus malignant nature of the neoplasm was 96%. Twenty-nine out of 30 cases were correctly placed as benign or malignant. However, one case of immature teratoma was incorrectly diagnosed with a mature cystic teratoma; as the immature elements were missed on scrape cytology. On the other hand, the frozen section was able to correctly classify the benign or malignant nature of the neoplasms in all 30 cases (100%) [Table 1].
Table 1: Comparison of diagnosis of frozen section diagnosis and scrape cytology diagnosis with final diagnosis

Click here to view


As far as the broad categorization of neoplasms is concerned, correct classification into surface epithelial tumors, germ-cell tumors, sex cord-stromal tumors, and others, could be done by scrape cytology in 28 of 30 cases. Of these two cases, one case of fibrothecoma was incorrectly diagnosed with a germ-cell tumor on scrape cytology. Furthermore, one case of myxoma ovary was incorrectly diagnosed with a teratoma on scrape cytology. Thus, the accuracy in broad classification using scrape cytology was 93%. Using frozen section, the broad categorization of ovarian neoplasms was correct in all 30 cases (100%) [Table 1].


   Discussion Top


The role of scrape cytology has been studied in ovarian neoplasms. Khunamornpong and Siriaunkgul[5] studied the role of scrape cytology of ovaries in the intraoperative consultation of ovarian lesions and found it to be a useful rapid cytodiagnostic tool. However, a comparative analysis of frozen section versus scrape cytology is needed to conclusively demonstrate the accuracy of scrape cytology.
Figure 1: Comparative scrape cytology and frozen section figures: (a) Frozen section showing ciliated columnar epithelium of serous cystadenoma, (H and E, ×20). (b) ciliated columnar lining suggestive of serous cystadenoma on scrape cytology, (toluidine blue, ×40)

Click here to view
Figure 2: Scrape cytology smear showing benign looking columnar cells with apical mucin suggestive of mucinous cystadenoma, (toluidine blue, ×40)

Click here to view
Figure 3: Smears showing benign ciliated cells, mucinous cells, and squamous cells suggestive of mature cystic teratoma, scrape cytology, (toluidine blue, ×40)

Click here to view
Figure 4: Toluidine blue-stained scrape cytology smear showing dysgerminoma cells with abundant cytoplasm, against a tigroid background, (×20)

Click here to view
Figure 5: Scrape smear showing rosette-like Call-Exner bodies (black arrow), (×20). The inset shows longitudinal nuclear groove giving a coffee-bean appearance, (Pap stain, ×20)

Click here to view
Figure 6: (a) Low-power view showing extensively branched papillaroid, overlapping cell clusters, (Pap stain × 10). (b) High-power view showing hyperchromatic nuclei, with vacuolated cytoplasm and high pleomorphism, (Pap stain, ×20)

Click here to view


In this study, we retrospectively compared the diagnosis provided on scrape cytology with those provided by frozen sections. The diagnostic accuracy in determining benign versus malignant nature of the neoplasm by scrape cytology was comparable with that of the frozen section. Thus, it can be used as an alternative intraoperative diagnostic tool in resource-poor settings where facilities of the frozen section are not available.

The advantages of scrape cytology include availability in resource-poor centers, which is the situation in a lot of centers in India. Rapid turnaround time is another advantage of scrape cytology over frozen sections, reducing the diagnosis time by almost half (10 min, vs. 15–20 min for frozen sections). In addition to these two, scrape cytology also offers remarkably accurate diagnoses. With a predictive value of 96% in determining benign versus malignant nature of neoplasms, scrape cytology is an acceptable diagnostic tool for guiding intraoperative decision-making. The accuracy of scrape cytology in broad categorization of ovarian neoplasms was also found to be fairly satisfactory (93%) comparable to the frozen section.

The pitfalls of scrape cytology lie in determining borderline cases. Although the diagnosis is possible in frankly malignant cases, it cannot determine invasion. In this study, one case of immature teratoma was incorrectly diagnosed with a mature cystic teratoma, as the immature element was missed on cytological sampling. Furthermore, a case of fibrothecoma was incorrectly diagnosed with a germ-cell tumor on scape cytology. This was due to incorrect interpretation of morphological features. This could also be due to the lack of characteristic morphologic features on the scrape, which can be overcome with greater experience in sampling and scrape preparatory techniques as well as interpretation.


   Conclusion Top


The pitfalls and limitations notwithstanding, scape cytology is still an acceptable, rapid, and fairly accurate alternative in resource-poor centers for guiding intraoperative management. In such settings, the routine use of intraoperative scrape cytology can aid surgical management.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
   References Top

1.
Gal AA, Cagle PT. The 100-year anniversary of the description of the frozen section procedure. JAMA 2005;294:3135-7.  Back to cited text no. 1
    
2.
Ratnavelu ND, Brown AP, Mallett S, Scholten RJ, Patel A, Founta C, et al. Intraoperative frozen section analysis for the diagnosis of early stage ovarian cancer in suspicious pelvic masses. Cochrane Database Syst Rev 2016;3:CD010360.  Back to cited text no. 2
    
3.
Shidham VB, Dravid NV, Grover S, Kher AV. Role of scrape cytology in rapid intraoperative diagnosis. Value and limitations. Acta Cytol 1984;28:477-82.  Back to cited text no. 3
    
4.
Rao S, Sadiya N, Joseph LD, Rajendiran S. Role of scrape cytology in ovarian neoplasms. J Cytol 2009;26:26-9.  Back to cited text no. 4
[PUBMED]  [Full text]  
5.
Khunamornpong S, Siriaunkgul S. Scrape cytology of the ovaries: Potential role in intraoperative consultation of ovarian lesions. Diagn Cytopathol 2003;28:250-7.  Back to cited text no. 5
    


    Figures

  [Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6]
 
 
    Tables

  [Table 1]



 

Top
  
 
  Search
 
    Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
    Access Statistics
    Email Alert *
    Add to My List *
* Registration required (free)  

 
  In this article
    Abstract
   Introduction
    Materials and Me...
   Results
   Discussion
   Conclusion
    References
    Article Figures
    Article Tables

 Article Access Statistics
    Viewed7    
    Printed0    
    Emailed0    
    PDF Downloaded4    
    Comments [Add]    

Recommend this journal